Data is stored on the hard disc. The more memory hard disc has the more data can be stored.
a File
CDs and DVDs both use a storage technique called optical storage. The data is stored on the discs by burning microscopic holes on the exterior of the disc, invisible to the naked eye. CD and DVD readers then perceive these holes as data and displays it to the user or computer. This is why you "Burn" something onto a CD/DVD.
5 times more data. A Blu-Ray's maximum storage data is 50GB
magnetic disc
A floppy disc is an old form of data storage device, so the answer would be CD's, DVD's and data sticks.
so you dont lose it......... . . . .
optical storage technology
A Blu-Ray is a spinning disc optical media used for the storage of lage amounts of data in a portable, typically read only format. CD's, DVD's, Laser disc's, VCD's and HD-DVD's all use(d) a red laser to read information stored on a spinning disc. Blu-Ray discs use a blue laser to read information stored on the discs. The frequency of a blue laser is much higher, allowing for the stored bits of data to be physically smaller, allowing form more information to be stored on a single disc. A single layer Blu-Ray disc stores about 25 GigaBytes of information. A double layer stores about twice that. You need a Blu-Ray reader orplayer in order to read or play a Blu-Ray disc. The technology is patented by the Sony Corporation, and is present in the Playstation 3 console.
Digital Video Disc or Digital Versatile Disc DVD ("Digital Versatile Disc", often incorrectly explained as "Digital Video Disc") is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality.
optical
It depends...if you are burning data to a DVD-RW disc on a computer, and you do not finalize the disc then you may add more data later. However, if you are using a DVD-R disc then it will need to be finalized to access the files, and you will not be able to add more data without first erasing the data that is currently stored on the disc.